Class XI & XII · Biology practice
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407 questions in this collection · Page 26 of 41
Body Fluids And Circulation
Which would be the heart rate of a person if the
cardiac output is 5L, blood volume in the ventricles
at the end of diastole is 100 mL and at the end of
ventricular systole is 50 mL?
A 50 beats per minute B 100 beats per minute C 75 beats per minute D 125 beats per minute
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Explanation: Cardiac output (CO) = heart rate (HR) × stroke volume (SV). SV = end diastolic volume − end systolic volume = 100 mL − 50 mL = 50 mL = 0.05 L. Given CO = 5 L/min, so HR = CO/SV = 5 L/min ÷ 0.05 L = 100 beats per minute. Therefore, option 2 is correct. The other options would require different SV values: 50 bpm would need SV = 0.1 L, 75 bpm would need SV ≈ 0.0667 L, 125 bpm would need SV ≈ 0.04 L. NCERT emphasizes CO = HR × SV in normal heart function.
🧠 Did You Know? Stroke volume depends on preload (EDV), afterload, and contractility. EDV here is the amount of blood in the ventricle at the end of diastole.
💡 NCERT Memory Line: CO = HR × SV, where SV = EDV − ESV; use given CO and EDV/ESV to find HR.
Body Fluids And Circulation
Match the Column - I with Column -II
Column-I
Column-II
(A)P-wave
(I)Depolarisation of ventricles
(B)QRS complex
(II)Repolarisation of ventricles
(C)T-wave
(III)Coronary ischemia
(D)Reduction in the size of T-wave
(IV)Depolarisation of atria
(V)Repolarisation of atria
Select the correct option:
A (A)-(II), (B)-(III), (C)-(V), (D)-(IV) B (A)-(IV), (B)-(I), (C)-(II), (D)-(V) C (A)-(II), (B)-(I), (C)-(V), (D)-(III) D (A)-(IV), (B)-(I), (C)-(II), (D)-(III)
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Excretory Products And Their Elimination
Which of the following factors is responsible for the formation of concentrated urine?
A Low levels of antidiuretic hormone. B Secretion of erythropoietin by juxtaglomerular
complex. C Maintaining hyperosmolarity towards inner
medullary interstitium in the kidneys. D Hydrostatic pressure during glomerular filtration.
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Excretory Products And Their Elimination
Use of an artificial kidney during hemodialysis may
result in:
A (A) and (B) are correct B (B) and (C) are correct C (A) and (D) are correct D (C) and (D) are correct
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Locomotion And Movement
Select the correct option.
A 8th, 9th and 10th pairs of ribs articulate directly
with the sternum. B There are seven pairs of vertebrosternal, three
pairs of vertebrochondral and two pairs of
vertebral ribs. C 11th and 12thpairs of ribs are connected to the
sternum with the help of hyaline cartilage. D Each rib is a flat thin bone and all the ribs are
connected dorsally to the thoracic vertebrae and
ventrally to the sternum.
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Locomotion And Movement
Which of the following muscular disorders is
inherited ?
A Tetany B Myasthenia gravis C Muscular dystrophy D Botulism
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Neural Control And Coordination
Which part of the brain is responsible for
thermoregulation?
A Hypothalamus B Cerebrum C Corpus callosum D Medulla oblongata
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Neural Control And Coordination
Which of the following statements is correct?
A Cornea consists of dense connective tissue of
elastin and can repair itself. B Cornea is an external, transparent and protective
proteinacious covering of the eye-ball. C Cornea is convex, transparent layer which is highly
vascularised. D Cornea consists of dense matrix of collagen and
is the most sensitive portion of the eye.
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Chemical Coordination And Integration
Which of the following glucose transporters is insulin-dependent?
A GLUT I B GLUT II C GLUT IV D GLUT III
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Chemical Coordination And Integration
Match the following hormones with the
respective disease:
(A)Insulin
(I)Addison's disease
(B)Thyroxin
(II)Diabetes insipidus
(C)Corticoids
(III)Acromegaly
(D)Growth Hormone
(IV)Goitre
(V)Diabetes mellitus
A (A)-(V), (B)-(I), (C)-(II), (D)-(III) B (A)-(II), (B)-(IV), (C)-(III), (D)-(I) C (A)-(II), (B)-(IV), (C)-(I), (D)-(III) D (A)-(V), (B)-(IV), (C)-(I), (D)-(III)
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